Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

php xpath problems

I am trying to parse a blogspot feed using xpath but it doesnt seem to be working with anything that I try. I am not sure if it is because of the namespaces or what but I was hoping someone could help me. Here is the code:

    $xml = simplexml_load_file('http://feeds.feedburner.com/blogspot/MKuf');

$next = $xml->xpath("//link[@rel='next']");
print_r($next);

This is just returning an empty array and it should not be. I tried it doing just link or just entry and it still is returning empty. The only one I can run on it that works is *. Any help is appreciated.

like image 820
ngreenwood6 Avatar asked Mar 18 '11 15:03

ngreenwood6


2 Answers

Like already said in the comment to you question, the document has a default namespace which you have to register before you can query it with XPath.

Since the linked duplicate only shows how to do it with DOM, I'll add an SimpleXml example

$feed = simplexml_load_file('http://feeds.feedburner.com/blogspot/MKuf');
$feed->registerXPathNamespace('f', 'http://www.w3.org/2005/Atom');
foreach ($feed->xpath('//f:link[@rel="next"]') as $link) {
    var_dump($link);
}

Manual Page: http://de.php.net/manual/de/simplexmlelement.registerxpathnamespace.php

Live Demo

like image 113
Gordon Avatar answered Oct 23 '22 15:10

Gordon


As Gordon said, you need to register the XML document's default namespace, like this:

$xml->registerXPathNamespace('default', 'http://www.w3.org/2005/Atom');

And then use the default prefix to refer to normal elements:

$next = $xml->xpath("//default:link[@rel='next']");

Newer versions may allow you to define the default ('') namespace. See http://www.qc4blog.com/?p=281 for more information.

like image 3
Philip Hanson Avatar answered Oct 23 '22 16:10

Philip Hanson